Then.swift

// The MIT License (MIT)
//
// Copyright (c) 2015 Suyeol Jeon (xoul.kr)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

import Foundation
#if !os(Linux)
  import CoreGraphics
#endif
#if os(iOS) || os(tvOS)
  import UIKit.UIGeometry
#endif

public protocol Then {}

extension Then where Self: Any {

  /// Makes it available to set properties with closures just after initializing and copying the value types.
  ///
  ///     let frame = CGRect().with {
  ///       $0.origin.x = 10
  ///       $0.size.width = 100
  ///     }
  @inlinable
  public func with(_ block: (inout Self) throws -> Void) rethrows -> Self {
    var copy = self
    try block(&copy)
    return copy
  }

  /// Makes it available to execute something with closures.
  ///
  ///     UserDefaults.standard.do {
  ///       $0.set("devxoul", forKey: "username")
  ///       $0.set("devxoul@gmail.com", forKey: "email")
  ///       $0.synchronize()
  ///     }
  @inlinable
  public func `do`(_ block: (Self) throws -> Void) rethrows {
    try block(self)
  }

}

extension Then where Self: AnyObject {

  /// Makes it available to set properties with closures just after initializing.
  ///
  ///     let label = UILabel().then {
  ///       $0.textAlignment = .center
  ///       $0.textColor = UIColor.black
  ///       $0.text = "Hello, World!"
  ///     }
  @inlinable
  public func then(_ block: (Self) throws -> Void) rethrows -> Self {
    try block(self)
    return self
  }

}

extension NSObject: Then {}

#if !os(Linux)
  extension CGPoint: Then {}
  extension CGRect: Then {}
  extension CGSize: Then {}
  extension CGVector: Then {}
#endif

extension Array: Then {}
extension Dictionary: Then {}
extension Set: Then {}

#if os(iOS) || os(tvOS)
  extension UIEdgeInsets: Then {}
  extension UIOffset: Then {}
  extension UIRectEdge: Then {}
#endif